Heating resistor type air flow rate measuring apparatus
US6435023B1 · kind B1 · utility
15Cited by
9References
16Claims
0Family size
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Key dates
| Filing date | Jan 17, 1997 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | Mar 3, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/69
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A heating resistor type air flow rate measuring apparatus is provided with a couple of heating resistors placed at the positions where those resistors may each interfere thermally with respect to an air flow, and a couple of driving circuits for driving those heating resistors. The air flow rate signal is obtained by calculating the difference between the output signals of a couple of heating resistors in terms of heat radiation rate effected by an air flow, and adding the difference value onto the output signal of one of the heating resistors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.